much thanks @Rodrigo. was try use https://github.com/azazdeaz/react-gsap-enhancer follow http://azazdeaz.github.io/react-gsap-enhancer/#/demo/using-transition-group?_k=fnq3qj but looks like it use older api. i thought enhancer was "best practice", but you example no use it. i get it to work now not use enhancer: https://codesandbox.io/s/61r70vyz1r
enhancer not needed? any other thing about my script could be better? i try to learn best ways.
again thanks!